[Public-List] Casting shrinkage

[Robert Alley]

Mike: you really shouldn't try to use the shoes as sinkers (:-}>.

R
On 7/17/2012 4:12 PM, Mike Lehman wrote:
> Unless you do not have old one because it fell off
>
>
> -----Original Message-----
>
> From: mpcylinderheads at gmail.com
> Sent: 17 Jul 2012 20:10:22 GMT
> To: Alberg 30 Public List -- open to all
> Subject: Re: [Public-List] Casting shrinkage
>
> I think selling them unfinished is a great idea, like chainplates on our boats I doubt any two boats will have the holes in the same spot. Any local machine shop would be able match your existing one to your new one for not a lot of money and save you countless hours of making the new one fit. Great Idea
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Robert Alley <1ralley at comcast.net>
> Sender: public-list-bounces at lists.alberg30.orgDate: Tue, 17 Jul 2012 15:21:47
> To: <public-list at lists.alberg30.org>
> Reply-To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org>
> Subject: Re: [Public-List] Casting shrinkage
>
> You may be on to something here.  In my misspent teenage youth, I worked
> for a very short period of time at a foundry which did, among other
> things, lost wax castings--i.e., castings in aluminum and brass/bronze
> for which the mold was wax, "lost" up the chimney when the piece was
> poured.  Plaster ( I think-it's been almost 50 years) molds were used to
> replicate the wax castings.  I can (barely)remember building up the
> thickness of cold wax molds when needed using warm wax and a fine
> toothed tool used to give a uniform additional thickness, precisely the
> depth of each tooth. Imperfections were removed in finishing. The
> process was similar to the work of a tiler, using a toothed trowel to
> smooth on a uniform thickness of mud for setting tile.  There is no
> reason the same could not be done to increase the thickness of a pattern
> of any kind--even a bronze shoe.
>
> PS: Costs could be kept down by providing each shoe or other part to
> each purchaser unfinished.  If you have a vice and a flapwheel for your
> power drill or angle grinder and a file or two, you can finish it
> yourself.  People might have to buy (or share) new drills for bolt
> holes-or at least sharpen the ones that have been in your tool box
> forever. A drill press would be best for the holes, but not absolutely
> necessary.
>
> Best to all,
>
> Rob Alley
> On 7/17/2012 2:21 PM, Rick Leach wrote:
>> Ahoy All!
>>
>> I don't know enough about the process to know if it would work, but what if the master part were dipped in wax and allowed to cool a few times to increase the overall dimensions enough to offset the shrinkage?
>>
>> Rick Leach, #121
>> _______________________________________________
>> These businesses support your Association:
>> http://www.alberg30.org/store/A30supporters.html
>> Please support them.
>> _______________________________________________
>> Public-List mailing list
>> Public-List at lists.alberg30.org
>> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
>>
>>
>
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
>
>



 1342629758.0